Shower base



FIG. 1 is a top perspective view of the shower base design with a front drainage;

FIG. 2 is a bottom perspective view of the shower base design shown in FIG. 1;

FIG. 3 is a top view of the design corresponding to FIG. 1;

FIG. 4 is a bottom view of the design corresponding to FIG. 2;

FIG. 5 is a right-side view of the design corresponding to FIG. 1;

FIG. 6 is a left-side view of the design corresponding to FIG. 1;

FIG. 7 is a front view of the design corresponding to FIG. 1;

FIG. 8 is a back view of the design corresponding to FIG. 1;

FIG. 9 is another top perspective view of the shower base design with an illustrative drainage grate;

FIG. 10 is a top perspective view of the shower base design, with a center drain; and,

FIG. 11 is a bottom perspective view of the shower base design shown in FIG. 10; wherein the sidewalls and bottom pan are shown in broken line and do not form a part of the design. 

CLAIM The ornamental design for a shower base, substantially as shown in the attached drawings. 